4 PACK: Pentel Super Hi-Polymer Lead Refill, 0.9mm Thick, B, 15 Pieces of Lead per Tube (50-9-B)

These Refill Leads fit the complete range of Pentel Mechanical Pencils. The composition of the hi-polymer lead is synthetic resin, graphite, and carbon, which give a very strong and flexible lead.4 PACK: Pentel Super Hi-Polymer Lead Refill, 0.9mm Thick, B, 15 Pieces of Lead per Tube (50-9-B)